[Python知识库]Python 日志模块，适合多模块应用配置文件，logger.py

配置文件??conf/log.conf

[LOGGING]
log_file =
max_bytes_each = 512000
backup_count = 10
fmt = |(asctime)s |(filename)s[line: |(lineno)d] |(levelname)s: |(message)s
logger_name = test_logger
log_level_in_console = 10
log_level_in_logfile = 20
console_log_on = 1
logfile_log_on = 1

[README]
log_level = '日志级别：CRITICAL = 50 ERROR = 40 WARNING = 30 INFO = 20 DEBUG = 10 NOTSET = 0'
log_on = 'console_log_on  = 1 开启控制台日志，0则关闭，logfile_log_on = 1 开启文件日志， 0则关闭'
log_file = 'log.txt所在的目录必须已存在'

文件名??logger.py

# -*- coding:utf-8 -*-

__author__ = 'WangBenYan'

import logging
from logging.handlers import TimedRotatingFileHandler
import threading
import configparser
import os


class Logger(object):

    def __init__(self, log_config):
        self.log_config = log_config

    def __new__(cls, log_config):
        mutex = threading.Lock()
        mutex.acquire()  # 上锁，防止多线程下出问题
        if not hasattr(cls, 'instance'):
            cls.instance = super(Logger, cls).__new__(cls)
            config = configparser.ConfigParser()
            config.read(log_config, encoding='utf-8-sig')
            cls.instance.log_filename = config.get('LOGGING', 'log_file')
            if not cls.instance.log_filename.strip(' '):
                # 日志存放路径
                cls.instance.log_filename = './logs/log.log'
            elif os.path.exists(cls.instance.log_filename):
                if os.path.isdir(cls.instance.log_filename):
                    print(u'日志路径不能为目录，终止程序')
                    exit()
            else:
                print(u'日志路径不存在，终止程序')
                exit()
            cls.instance.max_bytes_each = int(config.get('LOGGING', 'max_bytes_each'))
            cls.instance.backup_count = int(config.get('LOGGING', 'backup_count'))
            cls.instance.fmt = config.get('LOGGING', 'fmt')
            cls.instance.log_level_in_console = int(config.get('LOGGING', 'log_level_in_console'))
            cls.instance.log_level_in_logfile = int(config.get('LOGGING', 'log_level_in_logfile'))
            cls.instance.logger_name = config.get('LOGGING', 'logger_name')
            cls.instance.console_log_on = int(config.get('LOGGING', 'console_log_on'))
            cls.instance.logfile_log_on = int(config.get('LOGGING', 'logfile_log_on'))
            cls.instance.logger = logging.getLogger(cls.instance.logger_name)
            cls.instance.__config_logger()
            cls.instance.logger.setLevel(1)
        mutex.release()
        return cls.instance

    def get_logger(self):
        return self.logger

    def __config_logger(self):
        # 设置日志格式
        fmt = self.fmt.replace('|', '%')
        formatter = logging.Formatter(fmt)
        """ 控制台日志开关 =2 则关闭控制台日志，只写日志文件，=1则打开控制台日志"""
        if self.console_log_on == 1:  # =1 如果开启控制台日志，非1 关闭
            console = logging.StreamHandler()
            console.setFormatter(formatter)
            console.setLevel(self.log_level_in_console)
            self.logger.addHandler(console)
            # 此处打印中文乱码，需解决
            print(u'当前控制台生效的日志级别为：', self.logger.getEffectiveLevel())

        if self.logfile_log_on == 1:  # 如果开启文件日志
            # rt_file_handler = RotatingFileHandler(self.log_filename, maxBytes=self.max_bytes_each,
            # backupCount=self.backup_count)
            rt_file_handler = TimedRotatingFileHandler(self.log_filename, when='D', interval=1,
                                                       backupCount=self.backup_count)
            rt_file_handler.setFormatter(formatter)
            rt_file_handler.setLevel(self.log_level_in_logfile)
            self.logger.addHandler(rt_file_handler)


logger = Logger('./conf/log.conf')
logger = logger.get_logger()

# 使用时，用from logger import logger
# 测试
# logger.debug('this is info level message')
# logger.info('this is info level message')
# logger.warning('this is warning level message')
# logger.error('this is error level message')
# logger.critical('this is critical level message')